Importance and operation guide for preloading spindle bearings of CNC machine tools
Preloading the CNC machine tool spindle bearing can eliminate its internal clearance, allow the rolling elements to bear a certain preload, and provide supporting force to the rings in all directions, so that the spindle can be correctly positioned, which helps to improve the bearing rotation accuracy. In addition, it can also improve the bearing stiffness, increase the bearing service life, reduce noise and vibration, increase the load capacity, improve the working condition, and increase the speed. To preload the machine tool spindle bearing, first adjust the bearing width difference or axial clearance, and then fasten the adjusted combined bearing to the CNC machine tool spindle for use, adjust the size of the machine tool spindle bearing spacer or gasket, adjust the screw and nut of the axial clearance, measure the starting friction torque while adjusting, and then use elastic elements such as cylindrical springs and butterfly springs to apply appropriate preload force to the bearing.
